- 1(current)
Q. No.1. \({ }_{26}^{56} \mathrm{Fe}\text{ and }{ }_{28}^{58} \mathrm{Ni} \)
2. \({ }_{26}^{58} \mathrm{Fe}\text{ and }{ }_{26}^{56} \mathrm{Fe}^{2+} \)
3. \({ }_{27}^{57} \mathrm{Co}\text{ and }{ }_{28}^{57} \mathrm{Ni} \)
4. \({ }_{28}^{57} \mathrm{Ni}\text{ and }{ }_{28}^{58} \mathrm{Ni} \)
Identify the pairs which are not isotopes?
(a) \(_{6}^{12}X, \ _{6}^{13}Y\)
(b) \(_{17}^{35}X, \ _{17}^{37}Y\)
(c) \(_{6}^{14}X, \ _{7}^{14}Y\)
(d) \(_{4}^{8}X, \ _{5}^{8}Y\)
1. (a), (d)
2. (b), (c)
3. (c), (d)
4. (b), (d)
Which of the following statements about the electron is incorrect?
| 1. | It is a negatively charged particle. |
| 2. | The mass of electron is equal to the mass of neutron. |
| 3. | It is a basic constituent of all atoms. |
| 4. | It is a constituent of cathode rays. |
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Determine the identity of a species if it has 16 protons, 18 electrons, and 16 neutrons:
| 1. | \(S^{-}\) | 2. | \(Si^{2+}\) |
| 3. | \(P^{3-}\) | 4. | \(\mathrm{S}^{2-}\) |
1. 20.1
2. 20.2
3. 20.8
4. 21.2
In \(_{35}^{80}Br\), the number of protons, neutrons, and electrons are:
1. 25, 45, 45
2. 35, 45, 35
3. 45, 45, 35
4. 80, 35, 35
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| Number of protons | Number of neutrons | ||
| 1. | Atom I | 18 | 18 |
| Atom II | 18 | 19 | |
| 2. | Atom I | 25 | 30 |
| Atom II | 25 | 31 | |
| 3. | Atom I | 37 | 42 |
| Atom II | 37 | 41 | |
| 4. | Atom I | 82 | 126 |
| Atom II | 81 | 126 |
An atom has a mass number of 13 and contains 7 neutrons. Determine its atomic number:
1. 6
2. 7
3. 4
4. 5
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The nuclei of which one of the following pairs are isotones:
| 1. | \(34 \mathrm{Se}^{74},{ }_{31} \mathrm{Ga}^{71}\) | 2. | \({ }_{38} \mathrm{Sr}^{84},{ }_{38} \mathrm{Sr}^{86}\) |
| 3. | \({ }_{42} \mathrm{Mo}^{92},{ }_{40} \mathrm{Zr}^{92}\) | 4. | \({ }_{20} \mathrm{Ca}^{40},{ }_{16} \mathrm{~S}^{32}\) |
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- 1(current)
Q. No.
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